Symbols:P/Permutation

Permutation in context of Ordered Selection

${}_n P_r$, ${P_n}^r$, $p_{n r}$ or ${}^n P_r$

The number of $r$-permutations from a set of cardinality $n$ is denoted variously:

${}_n P_r$

${P_n}^r$

$p_{n r}$

${}^n P_r$

There is little consistency in the literature.

On $\mathsf{Pr} \infty \mathsf{fWiki}$ the notation of choice is ${}^n P_r$.

The $\LaTeX$ code for \({}_n P_r\) is {}_n P_r .

The $\LaTeX$ code for \({P_n}^r\) is {P_n}^r .

The $\LaTeX$ code for \(p_{n r}\) is p_{n r} .

The $\LaTeX$ code for \({}^n P_r\) is {}^n P_r .

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): permutation: 1.
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): permutation: 1.